The Mind's Eye
On the retina, at the back of your eye, there is a sort of picture, and it is upside down. So if seeing was a simple matter of watching pictures in your head, you'd have to stand on your head to see the world normally.
Even more important, the 'picture ' is confused, ambiguous and in constant motion. Yet, as we move we know where we are, how we're moving, and we can describe the things we see.
The scientists have only just begun to unravel the mysteries of how we see lines, depth, colour and motion. The little they do know may turn your world upside down.
Narrator COLIN BLAKEMORE
Film cameraman BRIAN HALL Video effects A. j. MITCHELL Film editors
JOHN STOTHART. ROY SHARMAN Music composed by MALCOLM CLARKE
BBC Radiophonic Workshop Editor SIMON CAMPBELL-JONES Written and produced by MARTIN FREETK